This is the GoPro Roll Bar Mount. Attach your GoPro camera to roll bars, tubes and more. Fits 1.4″ to 2.5″ (3.5cm – 6.35cm) diameter tubes. Perfect for clamping your camera to the radiator cap (both metal and plastic caps) on karts. You can also clamp to bike frames, bumper bars, ski/surfboard racks, or anything else that is in the size range above. Comes with pivoting orientation arms allowing for 3-way adjustability, ensuring you can get the angle you want.